Might be hard to do but someone should compare the ratio of NBA ratings of fans who watch on TV to fans who stream games online. Adding the two together might paint a different picture.
Where as some fans probably tune into their games either on mainstream TV or one dedicated channel, the Raps are practically off the grid and scattered all over cable. And the Raptors
have a younger audience. You'll see that at a game in the stands. That's a demographic more likely to use other means to watch than the most expensive cable package.
Look how many hardcore fans can't even see a great show like "Open Gym".